Osburh or Osburga (died before 856) was the first wife of King Æthelwulf of Wessex and mother of Alfred the Great. Alfred's biographer, Asser, described her as "a most religious woman, noble in character and noble by birth".

She is best known for Asser's story about a book of Saxon songs which she showed to Alfred and his brothers, offering to give the book to whoever could first memorise it, a challenge which Alfred took up and won. This exhibits the interest of high status ninth-century women in books, and their role in educating their children.

Osburh was the daughter of Oslac (who is also only known from Asser's Life), King Æthelwulf's pincerna (butler), an important figure in the royal court and household. Oslac is described as a descendant of King Cerdic's Jutish nephews, Stuf and Wihtgar, who conquered the Isle of Wight. and, by this, is also ascribed Geatish/Gothic ancestry.